Sewing-machine shuttle



(-No Model.)

m G. W.-BURGESS. SEWING MACHINE SHUTTLE.

Patented May 29,1883.

Llthogmphar. Washingtun. o. c.

a UNITED: STATES PATENT OFFICE.

GEORGE W. BURGESS, OF BOSTON, MASSACHUSETTS.

SEWING-MACHINE SHUTTLE.

SPECIFICATION forming part of Letters Patent No. 278,%( )3, dated May 29, 1883.

' ApplicationfiledMarch 6,1882. (No model.)

To all whom it may concern Be it known that I, GEORGE W. BURGESS, of Boston, in the county of Suffolk and State of Massachusetts, have'invented certain new and useful Improvements in Sewing-Machine Tension Devices, of which the following is a specification.

The object of my invention is to provide a tension device adapted to operate in connection with a fiat bent spring shuttle latch and the shuttle-body by means of an adjustingscrew and frictionalvdevices arranged to bear against the thread in such manner as torender a more perfect tension upon the same, whereby very fine or coarse thread may be employed upon the bobbin of the shuttle and control its a removal therefrom by the movement of the shuttle in a more uniform manner, and also inafter more fully described, and sat forth in the claims.

Figure 1 represents a perspective view of a sewing-machine shuttle with the mode of producing the tension applied thereto, the latch being raised. Fig. 2 represents a sectional top plan of the same. Fig. 3 represents a side ele: vation. l

A represents the-shuttle, ofusual construction, and provided with the bobbin B, journaled within the bearing at each end of the shuttle A, which is provided with the flat bent spring steel latch G, pivoted at its rear end'to the side of the shuttle, near its heel, and provided with a spring-catch, D, as heretofore. The frontend portion of the said latch C is bent at a right angle, forming a narrower friction-bar, E, the lower edge of which rests upon the top of the journal of the bobbin, and its inner face bears slightly against the oval outer face of the bobbin-head. The frictional contact thereon prevents the bobbin from revolving too far at the sudden movements of the shuttle, so as to prevent the thread from unwinding from thebob bin'only as fast as it may be drawn through the tension formed upon the thread T as it passes through the hole F in the sideof the shuttle and is brought into contact with the inner face of the flat spring-latch O, the tension thereon bein gregulated by means of the ad justing-screw H, passing horizontally through a portion of the front end of the-shuttle A and entering the longitudinal grooveL, formed near the straight side thereof, and its end having a W bearingagainstthe sideoftheright-angleextension P, formed upon the end of the said springlatch C, which is adapted to be received within the said groove'L when the latch is closed as 7 through a similar hole or slot,.S, just below the former slotted h0le,1t, thus passing the thread T around the small short tongue formed by the said slotted holes R and S. By this constructi on the tension upon the shuttle-threadis made more variable, and is rendered more uniform and the devices more durable, being less efiected by the sudden concussions as the shuttle-is reciprocated. By arranging the said thread tension holes R and S nearthe front or forward end of the shuttle, and one directly above the other, the frictional contact of the springlatch O is adapted for a more variable adjust ment to thesize and quality of thethread used, as the bearing of the latch upon the same'is secured. at a point near the free end of such spring-latch;or such frictional contact is far ther removed from the pivot of the latch, consequently more variable, thereby permitting greater nicety of tension upon the shuttlethread.

Having thus described my invention, what I claim is-- v 1. The combination, with the shuttle A, of the pivoted spring-latch 0, provided with the right-angle friction-bar E, extending transversely across the journal of the shuttle-bobbin, and having the extension vP,-adaptedto be adjusted within the longitudinal groove L, formed near the opposite side of the shuttle, by means of the adjusting-screw H, whereby the said spring-latch C may produceatension upon the thread and a friction upon the bobbin, as

and for the purposes set forth.

2. The shuttle A, having the thread-tension as shown and described. 7

3. lhe shuttle A, provided at its forward end with a central bearing for the bobbin, and the longitudinal groove L, formed near the side of the same, and having pivoted to one side thereof the spring-latch 0, provided with the right-angle friction-bar E, extending transversely across the journal of the bobbin, and

having the arm P,'extending within the said groove L and adapted to be adjusted therein 15 by means of theadjusting-screw H, passing from the spring side of the shuttle, so as to produce a tension upon the thread and africtional tension upon the bobbin and increase thefrictional hearing of the said adjustingscrew, sub- 20 stantially as shown and described, as and for the purposes set forth.

GEORGE W. BURGESS. Witnesses:

SYLVENUs WALKER, GEO. L.- LEWIS. 

